Condiment mustard most used in commerce for commercial prepared mustards and mustard powder. Seeds are darker and hotter than white mustard (Brassica hirta). Now commonly used in place of black mustard (Brassica nigra) because it is easier to harvest. Formerly sold incorrectly as black mustard. Much of the seed industry has the true botanical identity of this mustard wrong. True black mustard is apparently not available as seed for planting purposes in North America.